OnReturn is a jQuery plugin that allows you to specify an alternative action/function when a form is submitted using the enter/return key (rather than clicking a submit button). This is especially helpful in situations where there are multiple submission areas on a page, but only one all-encompassing form (yes, I'm glaring at you .NET).
You can check out official demos and documentation at http://jquery.kuzemchak.net/onreturn.php
These details are provided for information only. No information here is legal advice and should not be used as such.